#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <unistd.h>
#include <stdlib.h>

int main()
{
	int server_sockfd,client_sockfd;
	int server_len,client_len;
//	struct sockaddr_un server_address;
//	struct sockaddr_un client_address;
		struct sockaddr_in server_address;
		struct sockaddr_in client_address;
	unlink("server_socket");
//	server_sockfd = socket(AF_UNIX,SOCK_STREAM,0);
	server_sockfd = socket(AF_INET,SOCK_STREAM,0);
	
//	server_address.sun_family = AF_UNIX;
//	strcpy(server_address.sun_path, "server_socket");
	server_address.sin_family = AF_INET;
	server_address.sin_addr.s_addr = htonl(INADDR_ANY);//inet_addr("127.0.0.1");
	server_address.sin_port = htons(9734);
	server_len = sizeof(server_address);
	bind(server_sockfd,(struct sockaddr*)&server_address,server_len);
	
	listen(server_sockfd, 5);
	while(1){
		char ch;
		printf("server waiting\n");
		
		client_len = sizeof(client_address);
		client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_address, &client_len);
		
		read(client_sockfd,&ch,sizeof(ch));
		printf("receive %c from client\n",ch);
		ch++;
		write(client_sockfd, &ch, sizeof(ch));
		
		close(client_sockfd);
	}
}
